From 9968d86d12185257cd1f8e2186c30477efc47336 Mon Sep 17 00:00:00 2001
From: Avichay Eyal <eavichay@gmail.com>
Date: Tue, 13 Oct 2020 17:17:34 +0300
Subject: [PATCH] API Compatibility for setItem

---
 src/mock-localstorage.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mock-localstorage.js b/src/mock-localstorage.js
index 9ca75f1..91350cc 100644
--- a/src/mock-localstorage.js
+++ b/src/mock-localstorage.js
@@ -2,13 +2,17 @@
 (function () {
 
     function createStorage() {
+        let UNSET = Symbol();
         let s = {},
             noopCallback = () => {},
             _itemInsertionCallback = noopCallback;
 
         Object.defineProperty(s, 'setItem', {
             get: () => {
-                return (k, v) => {
+                return (k, v = UNSET) => {
+                    if (v === UNSET) {
+                        throw new TypeError(`Failed to execute 'setItem' on 'Storage': 2 arguments required, but only 1 present.`);
+                    }
                     k = k + '';
                     if (!s.hasOwnProperty(k)) {
                         _itemInsertionCallback(s.length);